Up-running-proof pipe string sealing check device

Abstract

The invention relates to an up-running-proof pipe string sealing check device, a communicating hole is further arranged on a lower joint of an expansion type packer, a sealing sleeve is sheathed on the lower joint of the expansion type packer, the sealing sleeve covers the communicating hole, an outer sealing ring is arranged between the lower joint of the expansion type packer and the sealing ring, a conical port at the upper end of the sealing sleeve is in matching and contact with the outer conical surface of the lower joint of the expansion type packer, a connecting head is mounted at thelower part of the lower joint of the expansion type packer, a constant pressure spring is arranged between the sealing sleeve and the connecting head, a sliding sleeve is mounted in the lower joint of the expansion type packer, the sealing ring is mounted on the outer wall at the upper part of the sliding sleeve, a lower sealing ring is mounted on the outer wall at the lower part of the sliding sleeve, the upper sealing ring is positioned above a pressure transfer hole, the lower sealing ring is positioned below the communicating hole, the sliding sleeve is fixed on the lower joint of the expansion type packer through a pin, and a valve ball is positioned on an upper port of the sliding sleeve. The device can use an up-running-proof back-off pipe string for carrying out the string pressure testing sealing check, thereby reducing the next pressure testing sealing check pipe string, saving the workover cost, reducing the workover time and having significant economic benefits.

Description

technical field [0001] The invention is a downhole equipment for inspecting the workover quality of an oil-water well, and a sealing inspection device for an anti-jacking pipe string. Background technique [0002] In the pumping well, in order to simplify the pumping string, facilitate the next operation, reduce the tubing in the well, and save the amount of tubing, the anti-jacking string is often used. The upper part of the tubing string is separated from the lower part of the layered tubing string, and there is a certain distance to reduce the tubing in the well and save the amount of tubing. When the tools on the oil extraction string are damaged but the lower layered oil string is not damaged, the production can be resumed only by lifting the upper oil extraction string for maintenance, so this kind of string can simplify the oil extraction string and facilitate the extraction workover operation. In order to check whether the lower layered tubing string is sealed, it ...

AI Technical Summary

Problems solved by technology

Therefore, the current pressure test method requires a separate lay-down pressure test to test the sealing string, which leads to high workover costs, long workover time, and poor economic benefits

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